i have a 90 with 5.0, it runs fine till it warms up then it sputters till the rpms get higher. the codes i got are, 15= eec processor or power to kam interrupted. 16= rpm to low to check o2 sensor. 22 map sensor. the eec code may have been from a broken wire at the eec relay that caused it to not run at all. any ideas of what my problem could be?